x86/hw_breakpoint: Prevent data breakpoints on direct GDT

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A data breakpoint on the GDT can be fatal and must be avoided.  The GDT in
the CPU entry area is already protected, but not the direct GDT.

Add the necessary protection.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200526014221.2119-3-laijs@linux.alibaba.com
Link: https://lkml.kernel.org/r/20200529213320.840953950@infradead.org

...

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Lai Jiangshan 2020-05-29 23:27:30 +02:00 • committed by Thomas Gleixner

parent d390e6de89

commit 97417cb9ad

1 changed files with 22 additions and 8 deletions

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arch/x86/kernel/hw_breakpoint.c

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